Increase the size of RSA key used in tests for OpenSSL 1.1.1 (#750)

* Increase the size of RSA key used in tests for OpenSSL 1.1.1

* here too

* In test_ssl.py as well
diff --git a/tests/test_crypto.py b/tests/test_crypto.py
index 5642120..d1c261b 100644
--- a/tests/test_crypto.py
+++ b/tests/test_crypto.py
@@ -573,7 +573,7 @@
     """
     # Basic setup stuff to generate a certificate
     pkey = PKey()
-    pkey.generate_key(TYPE_RSA, 384)
+    pkey.generate_key(TYPE_RSA, 512)
     req = X509Req()
     req.set_pubkey(pkey)
     # Authority good you have.
@@ -917,7 +917,7 @@
         `PKey.generate_key` generates an RSA key when passed `TYPE_RSA` as a
         type and a reasonable number of bits.
         """
-        bits = 128
+        bits = 512
         key = PKey()
         key.generate_key(TYPE_RSA, bits)
         assert key.type() == TYPE_RSA